<https://tonmo.com/threads/filter-isues.7925/>
<http://schema.org/articleBody>
"I recently got a cascade 1000 cansiter filter, and i was wondering how often i should change the filter medium, or what signs i should look for to see if it should be changed. \r\n\r\nalso how much salt do you add to a gallon to get optimal gravity..."
<https://tonmo.com/threads/filter-isues.7925/#post-102080>